J. Planar Chromatogr. 24, 441-444 (2011). HPTLC of plant extracts and 17 polyphenolic compounds (apigenin, apigenin-7-glucoside, ellagic acid, hyperoside, isoquercitrin, kaempferol, kaempferol-3-glucoside, kaempferol-3-glucuronide, luteolin, luteolin-7-glucoside, methyl brevifolincarboxylate, myricetin, quercetin, quercetin-3-glucuronide, rutin, tiliroside, ellagic acid 3,3’-di-O-methyl ether 4-xylopyranoside) on silica gel (prewashed with methanol) with toluene - ethyl formate - formic acid 7:5:1 in an automatic developing chamber set with a twin-trough chamber at 22 °C and a relative humidity of 48 %. Detection under UV light at 254 and 366 nm, and at 366 nm after spraying with 1.0 % methanolic diphenylborinic acid 2-aminoethylester.

J. Liq. Chromatogr. Relat. Technol. 34, 1502-1517 (2011). HPTLC of irinotecan in bulk drug and injectable formulations on silica gel with acetone - ethyl acetate 17:3 + 1 drop acetic acid. Quantitative determination by absorbance measurement at 366 nm. The hRf of irinotecan was 31. Linearity was 50-500 ng/zone. The LOD and LOQ was found to be 10 and 33 ng/zone. The intra-day precision was 4.3 % (n = 6) and inter-day precision over three different days was 3.1 %. Intra-day and inter-day accuracy were 96.9-100.3 % and 96.5-98.7 %, respectively. Recovery (by standard addition) ranged from 94.6-101.4 %.

J. Planar Chromatogr. 24, 367-372 (2011). TLC of piroxicam, meloxicam, tenoxicam, and isoxicam on silica gel with ethyl acetate - ethanol - toluene 6:3:1 + 2 drops of 25 % ammonia. Quantitative determination by densitometry in absorbance mode at 360 nm. Linearity was between 50-500 ng/zone. The hRf value was 53 for piroxicam, 78 for meloxicam, 61 for tenoxicam, and 82 for isoxicam. LOD were 10, 30, 10, and 20 ng/zone and LOQ were 20, 80, 40, and 40 ng/zone for piroxicam, meloxicam, tenoxicam, and isoxicam, respectively. The recovery was in the range of 93.2-102.9 % with %RSD of less than 1 %. The inter- and intra-day precision (%RSD) was between 0.3-0.8 %.

J. Planar Chromatogr. 25, 559-565 (2012). HPTLC of zafirlukast on silica gel with toluene - methanol - acetone 7:2:1. Quantitative determination by absorbance measurement at 240 nm. Linearity was in the range of 50-400 ng/zone. Limits of detection and quantification were 16 and 50 ng/zone, respectively.

J. Planar Chromatogr. 25, 168-173 (2012). HPTLC of arbutin in commercial whitening creams with methanol - chloroform - acetic acid 7:12:1. Quantitative determination by absorbance measurement at 254 nm. The hRf value of arbutin was 40. LOD and LOQ were found to be 42 and 112 ng/zone, respectively.

J. Planar Chromatogr. 26, 37-42 (2013). HPTLC of hydrocortisone acetate (1) and 2-phenoxyethanol (2) in cream on RP-18 with water-methanol 4:11. Quantitative determination by absorbance measurement at 270 nm. Linearity was in the range of 4.2-13.0 µg/zone for (1) and 0.8-4.3 µg/zone for (2). LOD and LOQ were 0.6 and 1.7 µg/zone for (1) and 0.2 and 0.5 µg/zone for (2), respectively. Intermediate precision was below 2 %.

J. Liq. Chrom. Rel. Tech. 38, 521-531 (2015). HPTLC of pitavastatin calcium on silica gel with ethyl acetate – methanol – toluene – glacial acetic acid 40:10:50:1. Quantitative determination by absorbance measurement at 335 nm. The hRF value of pitavastatin was 40. Linearity was between 25 and 150 ng/zone. The LOD and LOQ were 5 and 14 ng/zone. The intermediate intra-day and inter-day precisions were below 2.9 % (n=3). Recoveries were found in the range of 100.2-102.4 %.

J. Planar Chromatogr. 28, 436-442 (2015). TLC of hydrocortisone acetate (1), fusidic acid (2), methyl paraben (3) and propyl paraben (4) on silica gel with methylene chloride – methanol – benzene 10:2:5. Quantitative determination by absorbance measurement at 240 nm. The hRF values for (1) to (4) were 13, 32, 49 and 59. The polynomial calibration range was between 1-15 μg/zone for (1) to (4). The intermediate precision was below 1.8 % (n=3). Recovery ranged 99.6-100.2 %.